"There was quite a heavy dust storm and people who've been coming into the park said it's quite horrific out on the roads getting here," she said.

There has been a flood watch declared for the Pastoral and Flinders districts.

The South Australian Farmers Federation says many pastoralists and graziers are rejoicing about some of their best rains in years.

More than 70 millimetres has been recorded in some places in the past day, after good falls last week.

Federation president Peter White says it gives some much-needed relief.

"We know that there were quite a number of properties that had de-stocked because they'd run out of feed and water, well this will certainly give them a boost, the feed will grow now and certainly help them considerably," he said.